Digital BW, The Print

Has anyone had a problem with uneven borders with the 1270?  By this I mean
that I can select Print With Preview, and whether I position the print
manually or select Center, there is always one border that is shorter than
the opposite side.  It usually doesn't bother me since I mat the prints, so
no one sees whether the borders are the same size.  But now it bothers me.
Any advice appreciated!

  --Ken